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Now, three researchers at the University of Pennsylvania, Alexander Platt, Daniel N. Harris, and Sarah Tishkoff, have done the converse analysis: examining the X chromosomes of the handful of completed Neanderthal genomes we have. It turns out there's also a strong bias toward modern human sequences there, as well, and the authors interpret that as selective mating, with Neanderthal males showing a strong preference for modern human females and their descendants.
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传承精华就是守住“根脉”。要遵循中医理论，善用中医思维，挖掘中医药宝库精华，发挥中医药在防病治病中的独特优势。加强名老中医学术经验、老药工传统技艺传承，开展基于古代经典名方、名老中医经验方、有效成分或组分的中药新药研发，让中医药瑰宝代代相传。
缺点：容易饱和（输入过大或过小时梯度接近0，导致梯度消失）